Conceptually, radar is pretty simple: send out a radio wave and time how long it takes to get back via an echo. However, in practice, there are a number of trade-offs to consider. For example, ...

The first automobile driver ever fined for speeding was Walter Arnold in England’s Kent County, circa 1896. Arnold, a Benz dealer, got caught going approximately 8 mph, well over the 2-mph limit for ...

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